21/9=3.5/x

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Solution for 21/9=3.5/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

21/9 = 3.5/x // - 3.5/x

21/9-(3.5/x) = 0

21/9-3.5*x^-1 = 0

-3.5*x^-1 = -7/3 // : -3.5

x^-1 = 0.66666667

-1 < 0

1/(x^1) = 0.66666667 // * x^1

1 = 0.66666667*x^1 // : 0.66666667

1.49999999 = x^1

x = 1.49999999

x = 1.49999999

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